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Haloalkanes and Haloarenes

JEE Main 2024 (Online) 4th April Evening ShiftMCQHard📈 Topic in 31% papers+4−1
Ques. 1JEE Main 2024, 4 April (Evening Shift)

Find out the major product formed from the following reaction. [Me : –CH3] [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]

Answer

(1) [figure]

Solution

Both C–Br are allylic.

[figure]

Step 1 (SN2'): Me2NH attacks the far end of C=C; C=C shifts and one Br- leaves (allylic shift).

Step 2 (SN2): the second Me2NH replaces the other Br ⇒ two NMe2 groups on adjacent carbons, C=C on the opposite side.

∵ cis and trans dibromide follow the same path ⇒ the same product, option (1)

Answer: (1)

Keep practising — Haloalkanes and Haloarenes

Ques. 2JEE Main 2024, 1 February (Morning Shift)

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). In the light of the above statements, choose the most appropriate answer from the options given below :

  1. (A) is correct but (R) is not correct
  2. Both (A) and (R) are correct and (R) is the correct explanation of (A)
  3. (A) is not correct but (R) is correct
  4. Both (A) and (R) are correct but (R) is not the correct explanation of (A)
Ques. 3JEE Main 2024, 1 February (Evening Shift)

Match List - I with List - II. Choose the correct answer from the options given below :

  1. (A)-(II), (B)-(III), (C)-(I), (D)-(IV)
  2. (A)-(III), (B)-(I), (C)-(IV), (D)-(II)
  3. (A)-(I), (B)-(II), (C)-(III), (D)-(IV)
  4. (A)-(IV), (B)-(III), (C)-(II), (D)-(I)
Ques. 4JEE Main 2024, 31 January (Morning Shift)

The product (C) in the below mentioned reaction is : CH3-CH2-CH2-Br [ ]KOH(alc) A HBr B [KOH(aq)] C

  1. Propan-1-ol
  2. Propyne
  3. Propan-2-ol
  4. Propene
Ques. 5JEE Main 2024, 31 January (Morning Shift)

[figure] The total number of hydrogen atoms in product A and product B is .

Ques. 6JEE Main 2024, 31 January (Evening Shift)

Identify structure of 2,3-dibromo-1-phenylpentane.

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 7JEE Main 2024, 31 January (Evening Shift)

Identify A and B in the following reaction sequence. [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 8JEE Main 2024, 30 January (Morning Shift)

Example of vinylic halide is :

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 9JEE Main 2024, 30 January (Morning Shift)

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). In the light of the above statements, choose the most appropriate answer from the options given below :

  1. (A) is true but (R) is false
  2. (A) is false but (R) is true
  3. Both (A) and (R) are true but (R) is not the correct explanation of (A)
  4. Both (A) and (R) are true and (R) is the correct explanation of (A)
Ques. 10JEE Main 2024, 30 January (Evening Shift)

Given below are two statements: In the light of the above statements, choose the most appropriate from the options given below:

  1. Both Statement I and Statement II are true.
  2. Statement I is true but Statement II is false.
  3. Both Statement I and Statement II are false.
  4. Statement I is false but Statement II is true.
Ques. 11JEE Main 2024, 29 January (Morning Shift)

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R : In the light of the above statements, choose the most appropriate from the options given below :

  1. A is true but R is false
  2. Both A and R are true but R is NOT the correct explanation of A
  3. A is false but R is true
  4. Both A and R are true and R is the correct explanation of A

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